Prime Minister Jacinda Ardern and Deputy Prime Minister Winston Peters have been overpaid accommodation allowances by thousands of dollars.
Both have paid back the overpayments - Ms Ardern repaid $12,082.19
and Mr Peters has repaid $9,123.29.
The Department of Internal Affairs told Ms Ardern and Mr Peters of the error late Monday afternoon.
The overpayment saw both of them receive Wellington accommodation allowances after they began living in official residences.
"The error occurred when the DIA's Ministerial Services continued to pay each of us a Member of Parliament's Wellington accommodation allowance after they had moved us into official accommodation, at which point payments should have stopped," the pair said in a statement.
"While mistakes happen, we have accepted the officials' apology. Appropriate use of taxpayer money is something we both take extremely seriously, and we have set a high bar for ourselves and others."